document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=40038>Question 40038</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Assume that a ball is thrown vertically upward with initial velocity fo 96 ft per second. The distance s(t) (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2. <BR>\n" );
document.write( "a. at what instant will it be back at the ground level?<BR>\n" );
document.write( "b. for what time interval is the ball more than 112ft above the ground? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #25465 by </B><A HREF=/tutors/aboutme.mpl?userid=venugopalramana><B>venugopalramana(3286)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=venugopalramana><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.geocities.com/venugopalramana/FREE_MATHS_ASSISTANCE.html valign=middle><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=25465\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> SEE THE FOLLOWING EXAMPLE WHICH IS SIMILAR TO YOURS AND TRY.<BR>\n" );
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document.write( " 1. Assume that a ball is thrown vertically upward with initial velocity of<BR>\n" );
document.write( "> 96 ft. per second.  The distance s(t) (in feet) of the ball from the ground<BR>\n" );
document.write( "> after t seconds is s(t) = 96t-16t^2.<BR>\n" );
document.write( "><BR>\n" );
document.write( "> a. at what instant will it be back at the ground level?<BR>\n" );
document.write( "AT GROUND S=0=96T-16T^2=16T(T-9)<BR>\n" );
document.write( "HENCE T=0 ..THAT IS BEFORE IT IS THROWN UP AND<BR>\n" );
document.write( "T=9...SO AFTER 9 SECS.IT WILL HIT THE GROUND ON FALL\r<BR>\n" );
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document.write( "> b. for what time interval is the ball more than 128 ft. above the ground.<BR>\n" );
document.write( ">   S=128=96T-16T^2.DIVIDING BY 16<BR>\n" );
document.write( "T^2-6T+8=0=T^2-4T-2T+8=T(T-4)-2(T-4)=(T-4)(T-2)=0<BR>\n" );
document.write( "T=2 SECS ON THE UPWARD TRAVEL AND<BR>\n" );
document.write( " T=4 SECS ON THE DOWNWARD TRAVEL.HENCE IT WILL BE OVER 128 FT.HIGH<BR>\n" );
document.write( "DURING T=2 TO 4 SECS. </SPAN>\n" );
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